Weldment

Abstract

A weldment includes metal materials that are welded to each other. At least one of the metal materials includes pure copper including an inevitable impurity, more than 2 mass ppm of oxygen, and an additive element selected from the group consisting of Mg, Zr, Nb, Fe, Si, Al, Ca, V, Ni, Mn, Ti and Cr. A method of manufacturing a weldment includes melting a dilute copper alloy material by SCR continuous casting and rolling at a molten copper temperature of not less than 1100° C. and not more than 1320° C. to make a molten metal, forming a cast bar from the molten metal, forming a dilute copper alloy member by hot-rolling the cast bar, and welding the dilute copper alloy member to a metal material. The dilute copper alloy material includes the pure copper, more than 2 mass ppm of oxygen, and the additive element,?

What is claimed is: 
     
       1. At least two different metal materials welded together, the at least two metal materials comprising:
 a first material comprising a welded portion and a non-welded portion; and 
 a second material comprising another welded portion and another non-welded portion including purified copper having a level of 4N or more purity including more than 10 mass ppm of oxygen, an additive element consisting of not less than 4 mass ppm and not more than 55 mass ppm of Ti, and an inevitable impurity including sulfur, the welded portion of the first material being welded to said another welded portion of the second material, 
 wherein the Ti in a form of TiO of not more than 200 nm in size, TiO 2  of not more than 1000 nm in size, TiS of not more than 200 rim in size, and Ti—O—S of not more than 300 nm in size is included in a crystal grain. 
 
     
     
       2. The least two metal materials according to  claim 1 , wherein the at least two different metal materials are welded to each other by Tungsten Inert Gas (TIG) welding. 
     
     
       3. At least two metal materials welded to each other to form a weldment, each of the at least two metal materials comprising:
 purified copper including a level of 4N or more purity including more than 10 mass ppm of oxygen, an additive element consisting of not less than 4 mass ppm and not more than 55 mass ppm of Ti, and an inevitable impurity including sulfur, 
 wherein said each of the at least two metal materials is welded to the other to form the weldment by Tungsten Inert Gas (TIG) welding, 
 wherein no blow hole is formed in the weldment, and 
 wherein the Ti in a form of TiO, TiO 2 , TiS, and Ti—O—S is included in a crystal grain.